Individual skill
mysql-slow-query-diagnose
Slow query diagnosis with root cause analysis and index optimization recommendations. Identifies TOP N slow queries, analyzes scan efficiency, calculates index hit rate, and suggests covering indexes — turning a 20-minute manual diagnosis into 8 seconds.
mysql-slow-query-diagnose/SKILL.md
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- Last checked
- Nov 5, 2026
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- Repository last updated
- Jun 22, 2026
- License
- MIT
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- engineering Derived category
- data Derived category
- data-databases Derived category
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# MySQL Slow Query Diagnose (Diagnosis + Optimization)
## Overview
Slow queries are the #1 cause of database performance degradation. This skill goes beyond simply listing slow queries — it performs **root cause analysis** for each one: how many rows scanned vs returned, which index was used (or missed), and what index to add to fix it.
Key capabilities:
- Identify TOP N slow queries by execution time, lock time, or scan rows
- Calculate **index hit rate** (rows_examined / rows_sent) — the key metric for query efficiency
- Analyze EXPLAIN plans to identify full table scans, filesort, temporary tables
- Suggest **covering indexes** with estimated improvement
- Output a prioritized action list sorted by impact
**Real-world result**: A DBA team reduced average slow query resolution from 20 minutes to 8.3 seconds — **144x improvement** — by having AI perform the diagnosis automatically.